The first three dudes look good enough. Good caterpillar. And nice male/female alteration.
The second one looks pretty weird. I think it's because you're lacking a basic style, it's too plain without much details. There should be some kind of pattern, maybe some colour-separating stripes. On the head, you should've made a head piece (maybe a bell! Besides, what's a clock without bells?). The initial body shaped should be altered, so as to get the pendulum type (long and thin, huge ball in the end) of body. There are too many stripes, just make it two-third of that many. You should also include more colours for it.
The next one is designed well, although the pose is not looking great. Make a standing straight (B/W type) type of view with a salute or bow. It is a servant, after all.
The last one, well, not much about it. Nice robe-wings, but I can't see the polka-dots on the female.
You are pretty good at this stuff, I think you'd better start a new Showcase Thread. ;)